I have already clicked and dragged the rows to a specific height (by eyeing it, not by entering values). I want a new row while preserving the heights of the previous rows. If I do it your way, then the next time I Add Row Below, the rows shrink and are no longer the height at which I specified. I would then have to re-enter the height in the inspector. This takes a while if I want rows of different heights. Also, since I made the row heights by eye, I would first have to write down all the row heights before adding a row. Then after adding a row (and thereby shrinking all the rows), I would then have to re-enter the heights I wrote down to get the table the way it was before.
I just want a way to append one row to the bottom of an existing table without altering the table at all. Keep in mind that each row may be a different height, and that I don't know what number corresponds to each row height.